"We've been working on it for two years and it is nearing the end of its completion in terms of the work that we're doing, but there is still a number of tweaks to go through before we're ready to release it.

"But I can say this: no matter where you are in the network, no matter where you use rail services, you will feel a massive improvement."

State Opposition leader John Robertson says the public deserves to see what is being planned before the changes are set in stone.

"What this report appears to show is that there will be areas where there will be fewer trains; places like Penrith, Revesby, Kogarah and Wyong all appear that there will be fewer trains stopping there," he said.

"Those commuters deserve the right to see this timetable and give feedback."